KCET2018PhysicsMagnetic Effects of Current
An electron is moving in a circle of radius ( r ) in a magnetic field B. Suddenly the field is reduced to ( B 2 ). The radius of the circular path is
Options
- A( r 2 )
- B( 2 r )
- C( r 4 )
- D( 4 r )
Correct answer
B. ( 2 r )
Step-by-step solution
The radius of the circular path followed by an electron in uniform magnetic field is given by [ array l r= m v q B r 1 B array ]